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Individual step embodiment of a processor - and part of the system pipelines during the search for defects in a data processing system
Individual step embodiment of a processor - and part of the system pipelines during the search for defects in a data processing system
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机译:处理器的单个步骤实施例-以及在数据处理系统中搜索缺陷期间的部分系统管线
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摘要
A data processing system on an integrated circuit 42 with microprocessor 1 and peripheral devices 60-61 is provided with an emulation unit 50 which allows debugging and emulation of integrated circuit 42 when connected to an external test system 51. Microprocessor 1 has in instruction execution pipeline which has several execution phases which involve fetch/decode units 10a-c and function execution units 12,14,16 and 18. The pipeline of microprocessor 1 is unprotected so that memory access latency to data memory 22 and register file 20 can be utilized by system program code which is stored in instruction memory 23. Emulation unit 50 provides means for emulating the unprotected pipeline of microprocessor 1 and for rapidly uploading and downloading memories 22-23. Emulation unit 50 operations in a manner to prevent extraneous operations from occurring which could otherwise affect memories 22-23 or peripheral devices 60-61 during emulation. IMAGE
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